[问答]

我正在用NIOSII 写SD卡驱动程序，写到初始化成功，但CMD24 和 CMD17 死活返回值不对，求大神解答，或者给个思路，给个源码

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问答对人有帮助，内容完整，我也想知道答案 0 int sd_read_sector(alt_u32 sd_base, int sdhc, alt_u32 sect, alt_u8 buf) { int i; alt_u8 rcode, token; alt_u32 addr, ocr; / byte addr for SD card; sector # for SDHC card / if (sdhc==0) addr = (sect<<9); else addr = sect; / send sd card read single block commend / rcode = sd_wr_cmd(sd_base, SD_CMD17_READ, addr, &ocr); ////if (rcode != 0x00){ printf("CMD17 command fails: R1=0x%02x n", rcode); return (-1); ////} / wait for data start token up to 0.1 sec / for(i=0; itiME_OUT; i++){ token = sd_spi_rd_byte(sd_base); if (token==SD_TOKEN_DATA_START) // correct response received break; } if (token!=SD_TOKEN_DATA_START){ //time-out printf("No data start token: last token=0x%02xn", token); return (-1); } / read one sector (512 bytes) / for (i=0; i<512; i++) buf[i] = sd_spi_rd_byte(sd_base); / read and discard two crc bytes / sd_spi_rd_byte(sd_base); sd_spi_rd_byte(sd_base); return (0); } /********************************************************************** * function: sd_write_sector() * purpose: write one sector (512 (2^9) bytes) from a buffer to sd card * argument: * sd_base: base address of sd card interface * sdhc: 0 for SD card; 1 for SDHC card * sect: sector number * buf: pointer to buffer * return: 0 for success; -1 otherwise * note: * - procedure: * 1. send write-one-sector command * 2. send data_start token * 3. send 512 bytes * 4. send 2 dummy crc bytes * 5 check data accept token * 5. wait for completion * - CMD24 argument * - standard capacity SD card: starting byte address (sect<<9) * - high capacity SDHC card: starting sector address (sect) * - 10 MHz sclk used to calculate # timeout cycles **********************************************************************/ int sd_write_sector(alt_u32 sd_base, int sdhc, alt_u32 sect, alt_u8 buf) { int i; alt_u8 rcode, token; alt_u32 addr, dummy; /* byte addr for SD card; sector # for SDHC card / if (sdhc==0) addr = (sect<<9); else addr = sect; / send sd card write single block commend / rcode = sd_wr_cmd(sd_base, SD_CMD24_WRITE, addr, &dummy); // error ////if (rcode != 0x00){ printf("nCMD24 command fails: R1=0x%02x n", rcode); return (-1); ////} / initiate transfer by send data start token / sd_spi_wr_byte(sd_base, SD_TOKEN_DATA_START); / send 512 bytes / for (i=0; i<512; i++){ sd_spi_wr_byte(sd_base, buf[i]); } / send two dummy crc bytes / sd_spi_wr_byte(sd_base, 0xff); sd_spi_wr_byte(sd_base, 0xff); / wait for data acceptance token up to 0.25 sec / for(i=0; i token = sd_spi_rd_byte(sd_base); token = token & 0x1f; // only 5 LSBs used if (token==SD_TOKEN_DATA_ACCEPT) // correct response received break; } if (token!=SD_TOKEN_DATA_ACCEPT){ printf("No data accept token: last token=0x%02xn", token); return (-1); } / wait for write completion */ for(i=0; i token = sd_spi_rd_byte(sd_base); if (token==0xff) // correct response received break; } if (token != 0xff){ printf("Write completion timeout: last token=0x%02xn", token); return (-1); } return (0); // ok } 0 已退回1积分
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